Here at "gma," we report the news, really trying not to make ourselves the center of it. But a new book from brian stelter has done just that. He came to the morning shows for a peek behind the scenes to see what it takes to give you news, information and fun. Dan harris spoke with him. Reporter: Every morning, 13 million people wake up with a morning news show on one of the major networks. They're profitable and the subject of hollywood movies. And the focus of a new book out today by "new york times" reporter brian stelter. Morning show is the only times a day that we let strangers into our house wn we're basically naked. Or wearing very few clothes. A lot of times we're watching in bed or bleary-eyed. We're letting these people into our homes. Reporter: Stelter has been obsessed with tv news, especially the morning shows, ever since he was a kid. Your mother used to wake you up to watch the news? My mother would wake me up for school. And she'd watch "good morning america." And I'd watch the "today" show. And we'd fight about it. Good morning,ca. Welcome to "cbs this morning." Welcome to "today," on a monday morning. Reporter: What made you pick this as the subject for your book? The morning shows have never been written about in a big book form. These shows are the profit centers of their networks. These shows basically subsidize the rest of the news coverage. Between nbc, abc, and cbs, there's a billion dollar of advertising revenue at stake every year. Reporter: As a freshman in college, stelter started a blog about the broadcast news business called tv newsroom. He was scooped up by "the new york times," as seen in the documentary, "page one." You're constantly looking at your phone. Do you ever sleep? I sleep a lot. Reporter: Stelter had a lack of sleep when he embedded at the morning shows for this book. The work that happened between 7:00 p.M. And 7:00 a.M. Was astonishing. I learned that every second of the show was obsessed about ahead of time. Reporter: You could have called me and I would have told you this. After months, stelter is as enthusiastic as ever. I'm more of a fan of the shows than when I started. It's harder than I thought. And these anchors are always tired. They're always exhausted. And yet, they make it look so easy. Brian, getting nine, ten hours sleep a night. Yeah. Thanks to dan harris for

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